CN107707109B - A kind of power circuit and air conditioner - Google Patents
A kind of power circuit and air conditioner Download PDFInfo
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- CN107707109B CN107707109B CN201710980496.7A CN201710980496A CN107707109B CN 107707109 B CN107707109 B CN 107707109B CN 201710980496 A CN201710980496 A CN 201710980496A CN 107707109 B CN107707109 B CN 107707109B
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
Abstract
A kind of power circuit and air conditioner, are related to electronic technology field, and the embodiment of the present application can prevent damage of the surge voltage to chip is controlled in power circuit.The power circuit includes: conversion circuit, control chip, transformer and vent unit；Conversion circuit connects AC power source, ac supply signal for exporting AC power source is converted to DC power signal, and the high-voltage signal of DC power signal is exported by the first DC output end, the low-voltage signal of DC power signal is exported by the second DC output end；The first end of transformer primary connects the first DC output end, the second end connection control chip of transformer primary；It controls chip and connects the second DC output end.The third end of the primary side of the input terminal and transformer of vent unit is connected, and the output end of vent unit connects protecting field.The application is applied to surge voltage of releasing in a power.
Description
Technical field
This application involves electronic technology field more particularly to a kind of power circuits and air conditioner.
Background technique
Surging signal is that a kind of moment due to caused by external lightning stroke, internal electrical equipment start and stop or failure is excessively electric
Pressure or instantaneous overcurrent.If surging signal acts on electrical equipment, electrical equipment and electrical equipment user can be threatened
Safety, and electrical equipment reliability of operation will also decrease, and need to take safeguard measure to electrical equipment.The prior art
In, the general AC power source incoming end using in power circuit, the method by the way that discharge tube is arranged between firewire and ground line,
Carry out surge of releasing.
For above situation, present inventor's discovery, when on zero curve there are when surge, using existing drainage method without
Method releases to surge.Also, when surge voltage is not above the operating voltage of discharge tube, discharge tube does not work, this
Sample one, which carrys out surge voltage, will flow to next part of the force.When therefore inhibiting surge using the prior art, surge may lead to
Each device is transmitted to control chip to the distribution capacity of ground connection on oversampling circuit, to damage control chip.
Summary of the invention
For existing surge of releasing method can not effective protection chip the technical issues of.The application provides a kind of power supply electricity
Road and air conditioner, by way of vent unit is arranged between the primary side and protecting field in transformer, so that power circuit
In when there is surge, surge can be made to release by the vent unit, and avoid surge traffic organising chip, Jin Erfang
Only damage of the surge voltage to control chip.
In order to achieve the above objectives, embodiments herein adopts the following technical scheme that
In a first aspect, the embodiment of the present application provides a kind of power circuit characterized by comprising conversion circuit controls core
Piece, transformer；Wherein, the conversion circuit connects AC power source, the ac supply signal conversion for exporting AC power source
For DC power signal, and the high-voltage signal of the DC power signal is exported by the first DC output end, it is straight by second
Stream output end exports the low-voltage signal of the DC power signal；The first end connection described first of the transformer primary is straight
Output end is flowed, the second end of the transformer primary connects the control chip；The control chip connection described second is straight
Flow output end；
The power circuit further include: vent unit, the primary side of the input terminal of the vent unit and the transformer
Third end be connected, the output end of the vent unit connects protecting field；The vent unit has first capacitor value C8, described
First capacitor value C8 meets following formula:Wherein, Cps1 is the transformer primary pair
The parasitic capacitance value of the transformer secondary, parasitic capacitance value of the Cse between transformer secondary and the protecting field,
Cps2 is the control chip to the parasitic capacitance value between the protecting field.
In the embodiment of the present application, when surge occurs in the first DC output end of conversion circuit, pass through time in transformer
Vent unit is set between grade side and protecting field, and the capacitance C8 of vent unit meets:Cause
This can by transformer primary to the parasitic capacitance of transformer secondary and transformer secondary to the capacitor of protecting field,
To release to surge.To avoid surge from passing through the primary side traffic organising chip damage control chip of transformer
Problem.
Second aspect, the embodiment of the present application provide a kind of air conditioner, including power circuit described in above-mentioned first aspect.Base
In same inventive concept, since the principle and beneficial effect of the solved problem of above-mentioned air conditioner may refer to above-mentioned first aspect
Content, overlaps will not be repeated.
Detailed description of the invention
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described.
Fig. 1 is a kind of power circuit provided by the embodiments of the present application；
Fig. 2 is a kind of power circuit and surge voltage leakage path schematic diagram provided by the embodiments of the present application；
Fig. 3 is a kind of schematic diagram of power circuit provided by the embodiments of the present application；
Fig. 4 is a kind of structural schematic diagram of power circuit provided by the embodiments of the present application；
Fig. 5 is a kind of power circuit provided by the embodiments of the present application；
Fig. 6 is the first output end of conversion circuit provided by the embodiments of the present application there are when surge voltage, and one kind is released logical
The simplified structure diagram in road；
Fig. 7 is a kind of power circuit provided by the embodiments of the present application and wherein the first output end of conversion circuit has wave
When gushing voltage, surge voltage leakage path schematic diagram；
Fig. 8 is the first output end of conversion circuit provided by the embodiments of the present application there are when surge voltage, and one kind is released logical
The simplified structure diagram in road.
Specific embodiment
With reference to the accompanying drawing, embodiments herein is described.
It is described as follows firstly, for technical term involved in the application:
X capacitor: a kind of safety capacitor, for inhibiting powered electromagnetic to interfere electricity container.Effect master generally in circuit
If: it is connected across power input line both ends and is used to eliminate DM EMI, EMI filtering, eliminating spark circuit etc. ensures electronic product
Finished product meets EMC requirement.
Y capacitance: a kind of safety capacitor, for inhibiting powered electromagnetic to interfere electricity container.In the application, it usually bridges respectively
Between power supply output line and protecting field, for inhibiting common mode interference, usually occur (firewire-protecting field, zero curve-guarantor in pairs
Shield ground).
In scene of the embodiments herein applied to surge of releasing in a power.Attached drawing 1 is using the application reality
A kind of power circuit for applying example, including conversion circuit 11, control chip 12 and transformer 13.Specifically, conversion circuit packet
AC signal input terminal AC1 and AC2 are included, for connecting AC power source, conversion circuit further includes ground terminal E, for connecting protection
Ground.The ac supply signal of access is passed through after receiving the ac supply signal of AC power source and filters, is whole by conversion circuit
Stream, is converted to DC power signal, and respectively by the first DC output end VCC output high direct voltage signal, defeated by the second direct current
Outlet VDD exports DC low-voltage signal.The input terminal 1 of the primary side of transformer 13 connects the first direct current output of conversion circuit 11
VCC, the connection control chip 12 of input terminal 3 of the primary side of transformer 13 are held, control chip 12 connects the second DC output end
VDD.Wherein control chip 12 is used to control conversion circuit 11 and exports to the primary electric current of transformer 13.
Wherein conversion circuit 11 specifically includes: filter L1 and rectifier DM1.Filter L1 is used for AC power source and electricity
Source circuit is isolated, and prevents the EMC between AC power source and power circuit from interfering, and generallys use a common mode inductance at present
Realize the function of filter L1.Rectifier DM1 is converted to straight for rectifying to the filter L1 ac supply signal exported
Galvanic electricity source signal, and by the high-voltage signal of the first DC output end VCC output DC power signal, pass through the second direct current output
Hold the low-voltage signal of VDD output DC power signal.Specifically, the first input end 1 of filter L1 connects the fire of AC power source
Line, the zero curve of the second input terminal 2 connection AC power source of filter L1, such as the firewire and zero curve of 220V alternating current.Rectifier DM1
First input end 1 connect with the first output end 3 of filter L1, the of the second input terminal 2 of rectifier DM1 and filter L1
The connection of two output ends 4；Rectifier DM1 rectifies the filter L1 ac supply signal exported, and by the direct current after rectification
Power supply signal is exported by the first DC output end and the second DC output end.Wherein, the first output end of rectifier DM1
First DC output end VCC, the first DC output end VCC of the other end connection conversion circuit 11 of 3 connection resistance R1, resistance R1
It is connect with the first input end 1 of the primary side of transformer 13.The second output terminal 4 of rectifier DM1 connects the of conversion circuit 11
Two DC output end VDD are connect with control chip.Conversion circuit 11 further includes capacitor C7, and one end of capacitor C7 connects the first direct current
Output end VCC, the other end connect the second DC output end VDD.
Further, conversion circuit 11 further include discharge tube DSA1, varistor Z1, varistor Z2, X capacitor C1 and
Y capacitance C3, C4.Wherein the one end discharge tube DSA1 is connect with protecting field, and one end is connected by varistor Z2 and AC power source firewire
It connects, for discharging the surge voltage on power grid.Varistor Z1 is connected between AC power source firewire and zero curve, is used for
Inhibit the surge voltage between firewire and zero curve.X capacitor C1 is connected between AC power source firewire and zero curve, for discharge firewire and
DM EMI signal between zero curve.Y capacitance C3 connection firewire connect zero curve and protection ground wire with protection ground wire, C4, for discharging
Common mode interference signal between firewire and zero curve.It further include X capacitor C2, Y capacitance C5, C6 in the conversion circuit.Capacitor C2 is connected to
Between filter fire wire output end and zero line output end, for discharging the DM EMI signal between firewire and zero curve.Y capacitance C5 connects
It connects between filter fire wire output end and protection ground wire, C6 connection filter zero line output end and protection ground wire, for discharging fire
Common mode interference signal between line and zero curve.In addition, the second of the first end 1 of 13 primary side of transformer and the primary side of transformer 13
A diode in parallel and a zener diode between end 3.Specifically as shown in Figure 1, the first end 1 of 13 primary side of transformer connects
The anode of zener diode ZD1 is connect, the cathode of the cathode connection diode D1 of zener diode ZD1, the anode of diode D1 is even
Connect the second end 3 of the primary side of transformer 13.The zener diode and diode are used to turn off conversion circuit 11 when control chip
13 primary side of DC output end and transformer between current supply circuit when, absorb transformer leakage inductance caused by peak voltage.
In above-mentioned power circuit, when in the ac supply signal of input there are when surge voltage, as eight are thick in attached drawing 2
Shown in dotted line, following 8 surge channels are shared:
Channel 1, firewire are to the leakage path of protecting field: varistor Z2- discharge tube DSA1- protecting field；
Channel 2, firewire are to the leakage path of protecting field: Y capacitance C3- protecting field；
Channel 3, zero curve are to the leakage path of protecting field: Y capacitance C4- protecting field；
Channel 4, firewire are to the leakage path of protecting field: filter L1-Y capacitor C6- protecting field；
Channel 5, zero curve are to the leakage path of protecting field: filter L1-Y capacitor C5- protecting field；
Channel 6, after over commutation, the leakage path of the first DC output end over the ground: rectifier DM1- transformer primary
To the parasitic capacitance Cps1- transformer secondary of primary side to the parasitic capacitance Cse- protecting field of protecting field；
Channel 7, after over commutation, the leakage path of the second DC output end over the ground: rectifier DM1-Y capacitor C9, C10-
Parasitic capacitance Cse- protecting field of the transformer secondary to protecting field；
Channel 8, after over commutation, the leakage path of the first DC output end over the ground: rectifier DM1- control chip to guarantor
Protect the parasitic capacitance Cps2- protecting field on ground.
As can be seen that, when occurring surge voltage in circuit, usually passing through conversion circuit 11 in above-mentioned power circuit
Ground terminal E releases surge voltage, such as channel 1-5.And when surge voltage is let out not over the ground terminal E of conversion circuit 11
When running out, surge voltage can flow to next part of the force.At this point, surge voltage may then pass through the output of conversion circuit 11
Above-mentioned channel 6-8, traffic organising chip 12 and transformer 13 are passed through in end.
Wherein, when surge voltage is released by channel 8, surge voltage passes through the first DC output end, pressure stabilizing two
Pole pipe ZD1 and diode D1 flows into control chip 12, then passes through the parasitic capacitance Cps2 between control chip 12 and protecting field
Protecting field is flowed to, so then may cause the damage of control chip 12.
Based on above-mentioned technical problem, the embodiment of the present application provides a kind of power circuit, as shown in Figure 3.The power circuit packet
It includes: conversion circuit 11, control chip 12 and transformer 13.Wherein, conversion circuit 11 connects AC power source, is used for AC power source
The ac supply signal of output is converted to DC power signal, and exports DC power signal by the first DC output end VCC
High-voltage signal, pass through the second DC output end VDD export DC power signal low-voltage signal.The of 13 primary side of transformer
One end 1 connects the first DC output end VCC, the connection control chip 12 of second end 3 of transformer primary.Chip 12 is controlled to connect
The second DC output end VDD.
The power circuit further include: vent unit 14, the primary side of the input terminal and transformer 13 of the vent unit 14
Third end is connected, and the output end of vent unit 14 connects protecting field；Vent unit has first capacitor value C8, first capacitor value C8
Meet following formula:
Wherein, Cps1 is parasitic capacitance value of 13 primary side of transformer to 13 primary side of transformer, and Cse is transformer 13 times
Parasitic capacitance value between grade side and protecting field, Cps2 are control chip 12 to the parasitic capacitance value between the protecting field.
Specifically, in the embodiment of the present application, it is specific right as long as surge can be released from the primary side of transformer 13
Vent unit 14 is connect with no restriction with which pin of 13 primary side of transformer.Specifically as shown in Fig. 2, vent unit 14 can
It to be connected on the pin 4 of transformer, also can connect on the pin 5 of transformer, also can connect the pin 6 in transformer
On, as long as surge can be released from the primary side of transformer 13.
In one embodiment, as shown in figure 3, the power circuit further includes zener diode ZD1, diode D1.Transformation
The first end 1 of 13 primary side of device connects the anode of zener diode ZD1, the cathode connection diode D1's of zener diode ZD1
Cathode, the second end 3 of the primary side of the anode connection transformer 13 of diode D1.The zener diode and diode are used for when control
When coremaking piece turns off the current supply circuit between 13 primary side of DC output end and transformer of conversion circuit 11, transformer leakage is absorbed
Peak voltage caused by feeling.In the prior art, when the first DC output end VCC is there are when surge voltage, surge voltage may
Pass through zener diode ZD1, diode D1 traffic organising chip.And in the application due in transformer secondary pin and guarantor
Vent unit 14 is connected between shield ground, and then when there are when surge voltage, can be avoided surge electricity by the first DC output end VCC
Pressure controls chip by zener diode ZD1, diode D1 traffic organising chip, so as to effective protection.
In a kind of example, as shown in figure 4, conversion circuit 11 includes: filter L1, rectifier DM1.Wherein, filter
The first input end of L1 and the firewire of AC power source connect, and the second input terminal of filter L1 and the zero curve of AC power source connect；
The first input end of rectifier DM1 and the first output end of filter connect, the second input terminal and filter L1 of rectifier DM1
Second output terminal connection；Rectifier DM1 rectifies ac supply signal, and the DC power signal after rectification is passed through
First DC output end and the second DC output end are exported.
Further, which further includes the first varistor unit ZU1, first capacitor unit CU1, the second capacitor
Unit CU2, third capacitor cell CU3, the 4th capacitor cell CU4, the 5th capacitor cell CU5, the 6th capacitor cell CU6；Wherein,
The firewire of one end connection AC power source of first varistor unit, the other end connect the zero curve of AC power source；First capacitor list
The firewire of one end connection AC power source of first CU1, the other end connect the zero curve of AC power source；One end of second capacitor cell CU2
The first output end of filter is connected, the other end connects the second output terminal of filter；One end of third capacitor cell CU3 connects
The firewire of AC power source, the other end connect protecting field；The zero curve of one end connection AC power source of 4th capacitor cell CU4, it is another
End connection protecting field；First output end of one end connection filter of the 5th capacitor cell CU5, the other end connect protecting field；The
The second output terminal of one end connection filter of six capacitor cell CU6, the other end connect protecting field.
In one embodiment, as shown in figure 4, the conversion circuit 11 further include: discharge tube DSA1, the second varistor list
First ZU2.Wherein the one end discharge tube DSA1 is connect with protecting field, and one end passes through the second varistor unit ZU2 and AC power source fire
Line connection, for discharging the surge voltage on power grid.Wherein due to can be by the wave on firewire in the embodiment of the present application
It gushes voltage to release by hereinafter vent unit 14, therefore, can also be saved in power circuit provided by the embodiments of the present application
Remove discharge tube DSA1.
Wherein, each of CU1-CU7 capacitor cell can be made of in series and parallel one or more capacitor elements.Such as figure
Shown in 5, in a kind of example, it include X capacitor C2, CU3 include Y capacitance C3, CU4 includes Y capacitance that CU1, which includes X capacitor C1, CU2,
C4, CU5 include that Y capacitance C5, CU6 includes Y capacitance C6.ZU1 includes varistor Z1.Varistor Z1 is connected to AC power source fire
Between line and zero curve, for inhibiting the surge voltage between firewire and zero curve.X capacitor C1 be connected to AC power source firewire and zero curve it
Between, for discharging the DM EMI signal between firewire and zero curve.Y capacitance C3 connection firewire connect with protection ground wire, C4 zero curve and
Ground wire is protected, for discharging the common mode interference signal between firewire and zero curve.It further include X capacitor C2, Y capacitance in the conversion circuit
C5,C6.Capacitor C2 is connected between filter fire wire output end and zero line output end, for discharging the differential mode between firewire and zero curve
Interference signal.Y capacitance C5 connection filter fire wire output end connect filter zero line output end and protecting field with protection ground wire, C6
Between line, for discharging the common mode interference signal between firewire and zero curve.In addition, the second varistor ZU2 includes varistor Z2.
Optionally, conversion circuit 11 further includes resistance R1, capacitor C7.The one end resistance R1 connects the first output end of rectifier DM1, resistance
First DC output end VCC of the other end connection conversion circuit 11 of R1, the primary of the first DC output end VCC and transformer 13
The first input end 1 of side connects.Rectifier DM1 second output terminal connection conversion circuit 11 the second DC output end VDD with
Control chip connection.One end of capacitor C7 connects the first DC output end VCC, and the other end connects the second DC output end VDD.
In the embodiment of the present application, it is contemplated that when the first DC output end VCC of conversion circuit is there are when surge voltage, surge
Voltage may be by two passes, i.e., " channel 6 " and " channel 8 " releases in attached drawing 2, the knot of simplified leakage path
Structure is as shown in Fig. 6: in " channel 6 ", surge voltage passes through the parasitic capacitance between the primary side and primary side of transformer
Parasitic capacitance Cse between Cps1 and the primary side and protecting field of transformer, and then flow to protecting field and release." logical
In road 8 ", surge voltage is flowed to protecting field Cps2 and is released by the parasitic capacitance between control chip and protecting field.
Control chip is damaged in order to avoid surge voltage release by above-mentioned " channel 8 ", then needs to increase total in " channel 6 "
Capacitance, so that surge voltage is released by " channel 6 ".Further, it is contemplated that the parasitic capacitance of transformer is very difficult
Control, it is also difficult to adjust, as shown in figures 3-5, use to connect between transformer secondary and protecting field in the application and release
Unit, i.e., a vent unit in parallel in parasitic capacitance of the transformer secondary to protecting field, and make the first of vent unit
Capacitance C8 meets following formula:
And then when the first DC output end VCC of conversion circuit 11 there are when surge voltage, enable surge voltage to the greatest extent can
It can be released by " channel 6 ", surge voltage will not be released by control chip, thus effective protection control chip.
In specific power circuit, as shown in fig. 7, surge voltage passes through " channel 6 " when the first DC output end is there are surge voltage
When " channel 8 " is released, the structure of simplified leakage path is as shown in Fig. 6, and the application is in transformer secondary
A Y capacitance C8 is connected between protecting field works as conversion to increase the capacitance between transformer secondary and protecting field
There are when surge voltage, enable surge voltage to be let out by " channel 6 " as far as possible by first DC output end VCC of circuit 11
It puts, without being released by control chip by " channel 8 ", thus effective protection control chip.
Further, since in power circuit provided by the embodiments of the present application, by way of increasing a vent unit 14 come
Damage of the surge voltage to control chip is prevented, therefore in power circuit provided by the embodiments of the present application, conversion can be saved
The discharge tube being connected in circuit 11 on firewire, i.e. discharge tube DSA1 in Fig. 4.So as to effectively prevent surge voltage to control
While the damage of coremaking piece, cost is saved.
Specifically, the range of the first capacitor value of vent unit 14 is 1000-2200pF.Vent unit 14 can be one
Y capacitance.In the application, by the parasitic capacitance of measuring transformer and control chip, the electricity of above-mentioned Cps2, Cps1, Cse are found
Capacitance is usually all within 200pF.Therefore in order to increase the parasitic capacitance in above-mentioned first channel, in selection vent unit
When capacitance, the capacity much larger than transformer and the parasitic capacitance for controlling chip can choose, therefore selected 1000pF or more
Capacitance.Meanwhile by experimental verification, in order to meet the requirement of safety leakage current, the capacitance of vent unit is also answered small
In 2200pF.Therefore, the range of the first capacitor value of vent unit 14 is 1000-2200pF in the application.
In one embodiment, it is TNY278PN that chip model is controlled in the application.As shown in figure 5, wherein controlling chip
Drain D pin connection transformer primary second end, the source S for controlling chip connects the second DC output end, enabled to draw
Foot EN passes through the second DC output end of capacitor C11 connection by the first DC output end of resistance R2 connection VCC, bypass pin BP
VDD。
In one embodiment, as shown in figure 4, power circuit further includes the 7th capacitor cell CU7, wherein the 7th capacitor
One end of unit is connect with the second DC output end, and the other end of the 7th capacitor and the primary side of transformer connect.Such as Fig. 5 institute
Show, the 7th capacitor cell specifically includes Y capacitance C9 and C10, wherein C9 and C10 series connection.Specifically, leakage path is " logical in such as Fig. 7
Road 7 ", the 7th capacitor cell are used to surge voltage be released to transformer when the second DC output end is there are when surge voltage
Grade side, then released away by parasitic capacitance of the transformer secondary to protecting field.Meanwhile in electricity provided by the embodiments of the present application
In source circuit, due to being connected to vent unit between transformer secondary and protecting field, so that transformer secondary is to protection
The total capacitance on ground increases, and then increases the total capacitance in " channel 7 ", therefore the relieving capacity in " channel 7 " can be improved, and prevents
Only surge flows to next part of the force.
In addition, the embodiment of the present application also provides a kind of air conditioner, which includes above-mentioned power supply provided herein
Circuit.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain
Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (9)
1. a kind of power circuit characterized by comprising conversion circuit, control chip and transformer；
Wherein, the conversion circuit connects AC power source, and the ac supply signal for exporting the AC power source is converted to
DC power signal, and the high-voltage signal of the DC power signal is exported by the first DC output end, pass through the second direct current
Output end exports the low-voltage signal of the DC power signal；The first end of the transformer primary connects first direct current
The second end of output end, the transformer primary connects the control chip；The control chip connects second direct current
Output end；
The power circuit further include: vent unit, the of the primary side of the input terminal of the vent unit and the transformer
Three ends are connected, and the output end of the vent unit connects protecting field；The vent unit have first capacitor value C8, described first
Capacitance C8 meets following formula:Wherein, Cps1 is the transformer primary to described
The parasitic capacitance value of transformer secondary, parasitic capacitance value of the Cse between transformer secondary and the protecting field, Cps2 are
The control chip is to the parasitic capacitance value between the protecting field.
2. power circuit according to claim 1, which is characterized in that
The range of the first capacitor value C8 is 1000-2200pF.
3. power circuit according to claim 1 or claim 2, which is characterized in that
The conversion circuit includes: filter, rectifier；Wherein,
The first input end of the filter is connect with the firewire of the AC power source, the second input terminal of the filter and institute
State the zero curve connection of AC power source；
The first input end of the rectifier and the first output end of filter connect, the second input terminal of the rectifier and filter
The second output terminal of wave device connects；First output end of the rectifier is connect with first DC output end, the rectification
The second output terminal of device is connect with second DC output end；
The ac supply signal that the filter is used to input the AC power source is filtered；
The rectifier to the filtered ac supply signal that the filter exports for being rectified to obtain the direct current
Power supply signal, and the high-voltage signal of the DC power signal is exported by first DC output end, by the direct current
The low-voltage signal of power supply signal is exported by second DC output end.
4. power circuit according to claim 3, which is characterized in that
The conversion circuit further include: the first varistor unit, first capacitor unit, the second capacitor cell, third capacitor list
Member, the 4th capacitor cell, the 5th capacitor cell, the 6th capacitor cell；Wherein, one end connection of the first varistor unit
The firewire of the AC power source, the other end connect the zero curve of the AC power source；One end of the first capacitor unit connects institute
The firewire of AC power source is stated, the other end connects the zero curve of the AC power source；Described in one end connection of second capacitor cell
The other end of first output end of filter, second capacitor cell connects the second output terminal of the filter；Described
One end of three capacitor cells connects the firewire of the AC power source, and the other end connects the protecting field；4th capacitor cell
One end connect the zero curve of the AC power source, the other end connects the protecting field；One end of 5th capacitor cell connects
First output end of the filter, the other end connect the protecting field；One end of 6th capacitor cell connects the filter
The second output terminal of wave device, the other end connect the protecting field.
5. power circuit according to claim 3, which is characterized in that
The conversion circuit further include: the second varistor unit, discharge tube；
One end of the second varistor unit connects the firewire of the AC power source, and one end connects the discharge tube；It is described
The other end of discharge tube connects protecting field.
6. power circuit according to claim 1 or claim 2, which is characterized in that the power circuit further includes diode, pressure stabilizing two
Pole pipe；
Wherein, the anode of the zener diode is connect with the first end of the transformer primary, the zener diode
Cathode is connect with the cathode of the diode, and the anode of the diode is connect with the control chip, and the diode
Anode connect the second end of the transformer primary.
7. power circuit according to claim 1 or claim 2, which is characterized in that
The power circuit further includes the 7th capacitor cell；Wherein, one end of the 7th capacitor cell and second direct current
Output end connection, the 4th end of the primary side of the other end and transformer of the 7th capacitor.
8. power circuit according to claim 1 or claim 2, which is characterized in that
The control chip model is TNY278PN；
The drain D pin of the control chip connects the second end of the transformer primary, and the source S of the control chip connects
Connect second DC output end.
9. a kind of air conditioner, which is characterized in that the power circuit including any one of the claims 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710980496.7A CN107707109B (en) | 2017-10-19 | 2017-10-19 | A kind of power circuit and air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710980496.7A CN107707109B (en) | 2017-10-19 | 2017-10-19 | A kind of power circuit and air conditioner |
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| CN107707109B true CN107707109B (en) | 2019-09-20 |
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| CN112978523B (en) * | 2021-04-02 | 2023-09-19 | 日立电梯（中国）有限公司 | Elevator control cabinet reliability ground equivalent verification system and method |
| CN116700106B (en) * | 2023-06-30 | 2024-04-19 | 合肥申威睿思信息科技有限公司 | Power-on and power-off time sequence control circuit and method |
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| JP2009232636A (en) * | 2008-03-25 | 2009-10-08 | Renesas Technology Corp | Charging device and semiconductor integrated circuit device |
| CN202058567U (en) * | 2011-05-05 | 2011-11-30 | 南海发展股份有限公司 | Lightning-proof isolation transformer |
| CN202172267U (en) * | 2011-08-23 | 2012-03-21 | 瑞斯康达科技发展股份有限公司 | An Ethernet interface protection circuit |
| CN202535063U (en) * | 2012-03-28 | 2012-11-14 | 冠捷显示科技(武汉)有限公司 | MOS tube grid electrode discharging circuit for main switch of switch power supply |
| CN204334331U (en) * | 2014-09-24 | 2015-05-13 | 帝发技术(无锡)有限公司 | The fans drive power supply of vehicle-mounted heater |
| US9750108B2 (en) * | 2015-04-02 | 2017-08-29 | Modern Home Lighting Inc. | Light emitting diode (LED) torchiere lamp with overheat and overvoltage protection functions |
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